Question

why ppc is concave to the origin

Answer 1

The shape of a PPF is commonly drawn as concave to the origin to represent increasing opportunity cost with increased output of a good. Thus, MRT increases in absolute size as one moves from the top left of the PPF to the bottom right of the PPF.

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Answer 2

PPC looks concave to the origin because of increasing marginal rate of

transformation/substitution (or increasing marginal opportunity cost). It means that

more and more units of commodity ‘y’ are to be sacrificed, to get each additional unit of

commodity ‘x’.

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